I was just looking at my stats on the waypoint app when I went to a campaign mission progress and looked at all the enemies I have killed/killed by. On mission 5 I had around 2100 kills on a sentinel and 1650 kills on marine infantry. I’m 100% sure I have not killed that many marines or sentinels, and I’m pretty sure they have not killed that much enemies. So what does this mean?
Lol, I have THOUSANDS of Marine kills from letting the reactor go critical on Galileo Base just to see what happens. Whoopsie…
Every time you betray a Marine it gets recorded as 530 kills in the enemy section. It’s a bug I posted about a while ago. The forum team said they were going to look into it, although they haven’t mentioned anything since then. I didn’t know about the Sentinels though. Did you betray some of them as well?
We’ve been investigating an issue involving a high number of Marine kills being reported. While we continue to work, take it easy on your comrades! 
More info to come.